As I understood, the HTC ONE is the best smartphone for an audiophile. How Iphone 5 compares to it?

What would be the second best smartphone in the quality of sound?

Also, I'm personally looking for a lightweight (around 112gr or less as Iphone 5) with a smaller screen than HTC ONE (Iphone's 5 would be ok, or even smaller) and quality of camera for photos and videos is very important too (don't care about megapixel, just fast and quality shoots for photos, and I'm satisfied with video of 720p (640x480) just want it of good quality). Using normal size SIM card, dual-sim, memory expansion slot, removable battery, Android - are additional pluses.`

I suggest you buy a Samsung phone. The galaxy S3, Note 2, and Galaxy S4 all support USB audio output. This is by far your best option for audio quality on the go. They are compatible with most USB DACs.